br.com.objectos.tftp.ReadOptions Maven / Gradle / Ivy

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/*
 * Copyright 2016 Objectos, Fábrica de Software LTDA.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package br.com.objectos.tftp;

import java.util.ArrayList;
import java.util.List;

/**
 * @author [email protected] (Marcio Endo)
 */
class ReadOptions {

  final int blockSize;

  public ReadOptions(int blockSize) {
    this.blockSize = blockSize;
  }

  @Override
  public boolean equals(Object obj) {
    ReadOptions that = (ReadOptions) obj;
    return blockSize == that.blockSize;
  }

  @Override
  public int hashCode() {
    return Integer.hashCode(blockSize);
  }

  public List toDataMessage(byte[] bytes) {
    int parts = (bytes.length / blockSize) + 1;
    int fullparts = parts - 1;

    List list = new ArrayList<>(parts);
    for (int i = 0; i < fullparts; i++) {
      byte[] part = new byte[blockSize];
      System.arraycopy(bytes, i * blockSize, part, 0, blockSize);
      list.add(DataMessage.get(i + 1, part));
    }

    int lastSize = bytes.length % blockSize;
    byte[] part = new byte[lastSize];
    System.arraycopy(bytes, fullparts * blockSize, part, 0, lastSize);
    list.add(DataMessage.get(parts, part));

    return list;
  }

}